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Old 19th February 2009, 09:13 AM   #21
fotios is offline fotios  Greece
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Quote:
Originally posted by SQLGuy


Magnetic contacts would, in most cases, be non-stainless ferrous metals. That means they would be prone to oxidation, especially if being repeatedly heated, cooled, and exposed to arcs.

Also, magentic materials lose magnetism when heated. High current relay contacts that rely on the magnetism of the contacts themselves might become bad connections under high current.
Thanks for the explanation, and yes it makes sense.

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Old 19th February 2009, 11:00 AM   #22
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+ and - 9V for the analog section seems a little low. Why not use dual 15 V supplies for more headroom ?

At the risk of being accused to be too precise: 39 uf is a value that is hard to get. 47 uf is a more common value. Please adjust the layout to accomodate for 47 uF or even 100 uf.
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Old 19th February 2009, 03:26 PM   #23
jwb is offline jwb  United States
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+/-9V is the most the CS3318 can handle.

The 39µF part is a specific part if you'll refer to the bill of materials. It's chosen to reduce power supply impedance in the band of interest (< 100kHz). Also I like using those polymer caps for their high reliability.
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Old 27th March 2009, 06:38 AM   #24
jwb is offline jwb  United States
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I finished designing the power supplies (thanks to the recent threads on shunt regulators). Here's the PDF, and the BOM has been updated.

Bill of Materials
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File Type: pdf ps.pdf (63.3 KB, 133 views)
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Old 3rd May 2009, 03:31 AM   #25
jwb is offline jwb  United States
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Been working on this layout for months. Hard to see what's going on in a PDF, since it's a six-layer board, but here it is anyway, for the curious.

A 500KB PDF file
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Old 3rd May 2009, 06:02 PM   #26
jwb is offline jwb  United States
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Updated bill of materials with latest references, prices, and availability.

Bill of Materials
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Old 6th May 2009, 10:10 PM   #27
jwb is offline jwb  United States
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And so it begins.
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Old 6th May 2009, 10:29 PM   #28
mlloyd1 is offline mlloyd1  United States
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exciting!
looking forward to the progression of construction pics and listening reports when you get to the end ...

mlloyd1
(who is another babylon 5 fan - even time i see the phrase "And so it begins ..." i hear kosh's voice and the last season's theme music.
what a great show ... )

Quote:
Originally posted by jwb
And so it begins.
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Old 10th May 2009, 08:33 PM   #29
jwb is offline jwb  United States
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That transformer I specified is useless. Digi-key says it's 16VAC in parallel, but it's not. It's 16VAC on one secondary, and 35VAC on the other. The correct transformer is Tamura 3FD-416. Sorry for the error.

Here are the manufacturing images for the board, in a 1MB PDF file. The pages, in order, are the outline, the silkscreen, the top solder mask, metal layers 1 through 6, and the bottom solder mask.

http://octothorpe.barelyconnected.ne...amp/gerber.pdf
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Old 13th May 2009, 03:05 AM   #30
jwb is offline jwb  United States
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Checked the footprints of all the parts against the board images. Looks like everything is going to fit OK.
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File Type: jpg fitting.jpg (41.2 KB, 418 views)
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